1896	May	The first President and company founder, Yoshihira Wada began business in Haramachi, Bunkyo-ku, Tokyo, and commenced manufacturing of pressure gauges and related products (at the first gauge factory in Japan).
1917	May	The company was reorganized as Tokyo Keiki Seisakusho Co., Ltd.
1948	December	Tokyo Keiki Seisakusho Co., Ltd. was liquidated and divided into Nagano Keiki Seisakusho Co., Ltd. and Tokyo Keiki Seisakusho Co., Ltd. (currently TOKYO KEIKI INC.). Head office and factories were located in Komoro-machi (currently Komoro-shi), Nagano-ken, with 5 million yen in capital.
1951	Octorber	Head office and factories were relocated to Ueda, Ueda-shi.
1954	May	Granted status as Japanese Industrial Standard Pressure Gauge Factory.
	August	Designation as Measurement Control Model Factory.
1957	May	Designation as a First Class Instrument Using Workplace.
1958	January	The Tokyo Factory was established in Chuo, Ohta-ku, Tokyo.
1964	March	The first phase of the construction of the Akiwa Factory was completed at Akiwa, Ueda-shi, Nagano-ken. Tokico Instrument Co., Ltd. (currently Hitachi Automotive Systems & Nagano, LTD.) was established through a joint venture with Tokico Co., Ltd. (currently Hitachi Astemo, Ltd.) and the sales of both companies’ products commenced.
	May	Nagano Keiki Service Co., Ltd. (currently NAGANO KEISO CO., LTD. was established by spinning off the maintenance division.
	December	The second phase of the construction of the Akiwa factory was completed. The Ueda factory (currently Ueda Measuring Instruments factory) was relocated.
1965	August	Authorized as Bourdon Tube Pressure Gauge and Mercury Filled Thermometer Factory. (JIS standard was authorized by the Ministry of International Trade and Industry.)
1966	December	The third phase of construction of Ueda Measuring Instruments factory was completed. The head office was relocated to Akiwa, Ueda-shi. Nagano Hanyo Keiki Mfg. Co., Ltd. was established.
1976	June	The Head Office was transferred to Higashimagome, Ohta-ku, Tokyo.
1978	July	Nagano Co., Ltd. was established by separation from the Tokyo factory.
1988	September	Acquired capital in Mahshin Co., Ltd (currently Yoshitomi-Mahshin Co., Ltd.).
	November	An engineering and sales agreement for pressure sensors was made with the Instruments Division of Dresser, Inc., U.S.A. (currently Ashcroft-Nagano Keiki Holdings, Inc.).
1989	February	Acquisition of capital in Nagano-ken Housou Shiza Co., Ltd. (currently Epoch Nagano Co., Ltd.). The production and sales of ceramic products commenced.
	July	Acquisition of capital in Yoshitomi Co., Ltd (currently Yoshitomi-Mahshin Co., Ltd.).
	November	The first phase of construction of the Maruko Electronic Instruments Factory was completed at Maruko-machi, Nagano-ken. Full scale production of pressure sensors commenced.
1991	January	Dresser-Nagano, Inc. (currently Ashcroft-Nagano, Inc.) was established in California, U.S.A., through a joint-venture with Dresser, Inc., U.S.A.
1995	February	Received the “Sasakawa Special Award for Inventions” from the Japan Society for the Advancement of Inventions Foundation, currently Society for the Advancement of Inventions (Public Interest Incorporated Foundation). Ueda Measuring Instruments factory and Maruko Electronic Instruments Factory obtained ISO 9001 certification.
1996	Octorber	A technological transfer and license agreement was made and entered into for high-pressure-related sensing technology with Delco Electronics (currently Delphi Automotive Systems), U.S.A.
1997	January	The second phase of the construction of the Maruko Electronics Instruments Factory was completed.
	July	The company name was changed to NAGANO KEIKI CO., LTD.
1998	September	A technological transfer and license agreement was made and entered into with Robert Bosch GmbH, Germany, regarding high-pressure sensing technology.
	Octorber	The new construction of the headquarters building was completed.
	December	Company Stocks were sold as over-the-counter stocks. Accreditation regarding the official proofreader for calibration of dead weight type pressure gauge was granted by JACSS (The Japan Calibration Service System).
1999	December	Sensor sub-assembly sales agreement was made and entered with Texas Instruments, U.S.A.
2000	December	The Ueda Measuring Instruments Factory and the Maruko Electronic Instruments Factory obtained ISO14001 certification. ADZ NAGANO GmbH was established through a joint-venture with ADZ, Germany.
2003	January	Received the “Nikkei Best Product Service Award in 2002” for KA series “small size pressure sensor for automotive applications”.
	4月	FUKUDA CO., LTD. became a wholly owned subsidiary of NAGANO KEIKI CO., LTD.
	September	Establishment of a resident office in Europe in Dresden, Sachsen, Germany.
2004	March	ZA Co, Ltd. (currently NAGANO KEISO CO., LTD.) became a wholly owned subsidiary of NAGANO KEIKI CO., LTD.
2005	February	NAGANO KEIKI CO., LTD. was listed on the second section of the Tokyo Stock Exchange.
	May	The Nagano Keiki Solutions Support Center (NSSC) was established in Ottendorf-Okrilla, Sachsen, Germany.
	August	The Maruko Electronic Instruments Factory obtained ISO/TS 16949: 2002 certification from the Japan Gas Appliances Inspection Association.
	September	Sun Cast Co., Ltd. became a wholly owned subsidiary of NAGANO KEIKI CO., LTD. Nagano Keiki Technical Solutions Center was opened in Ikuta, Ueda-shi.
2006	May	Ashcroft Holdings,Inc.（currently Ashcroft-Nagano Keiki Holdings,Inc.）became a wholly owned subsidiary of Nagano Keiki Co., Ltd.
2007	4月	NAGANO KEIKI CO., LTD. was listed on the 1st section of the Tokyo of the Tokyo Stock Exchange
2008	February	S3C, Inc. (Sunnyvale, California) became a subsidiary of NAGANO KEIKI CO., LTD.
	April	New-Era Co., Ltd. became a wholly owned subsidiary of NAGANO KEIKI CO., LTD.
2009	April	Yoshitomi Co., Ltd. merged with Mahshin Co., Ltd. and changed the company name to Yoshitomi Mahshin Co., Ltd.
	July	NAGANO KEISO CO., LTD. merged with ZA Co., Ltd.
2013	November	An business alliance agreement was signed with Elmos Semiconductor AG, Germany and Silicon Microstructures Inc,, USA for the joint development and provision of ASIC and MEMS type pressure sensor elements.
2014	July	Establishment of manufacturing joint venture, JADE Sensortechnik GmbH with Intelligente Sensorsysteme Dresden GmbH (i2s).
2017	July	FUTABA SOKKI CO., LTD. became a wholly owned subsidiary of NAGANO KEIKI CO., LTD.
2019	January	NAKAMURA-KANAGATA CO., LTD became a wholly owned subsidiary of NAGANO KEIKI CO., LTD.